Police keep a perimeter around the area where a gas explosion leveled a strip club in Springfield, Mass., on Friday evening. Investigators were trying to figure out what caused the blast where the multistory brick building housing Scores Gentleman’s Club once stood.

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A natural gas explosion that injured 18 people and damaged 42 buildings in Springfield’s entertainment district was blamed Sunday on a utility worker who accidentally punctured a high-pressure pipeline while looking for a leak.